Nuclear Fit vs Spartan Race: distance, stations, price & difficulty compared (2026-27)

Nuclear Fit is an outdoor hybrid fitness race run by Nuclear Races at its obstacle course site near Brentwood, Essex. Instead of an indoor track, athletes run six 1 km trail loops, each including two 4 ft hurdles, and complete a fitness station after each loop in a central arena called The Core.

The stations use farm-themed equipment: a tyre flip, a farmers urn hug, a plough pull, a milk churn carry, a sandbag duck-and-throw and a squat-and-lift, with separate loads for men and women. Categories include singles, doubles and mixed doubles, plus a three-person relay in which each member completes two runs and two stations, and a Pro wave with longer station distances. Waves start every 10 minutes, chip timing records each run and station split, and there is a 2-hour time limit. It suits runners and gym-goers who want a hybrid race on trails rather than indoors.

Spartan Race is an obstacle course racing series established in Vermont, USA, in 2010, with events in more than 40 countries. Courses combine off-road trail running with obstacles such as walls, barbed-wire crawls, monkey bars and a spear throw, and they often include mud and water.

The main distances are the Sprint (5 km, 20 obstacles), the Super (10 km, 25 obstacles), the Beast (21 km, 30 obstacles) and the Ultra (50 km, 60 obstacles). Completing a Sprint, Super and Beast in one calendar year earns the Spartan Trifecta, and many venues host Trifecta Weekends with all three races. Spartan also runs Stadion races in sports stadiums, trail races, kids' races, competitive Elite and Age Group heats, and endurance events. The Sprint is pitched at first-timers, while the Beast and Ultra suit experienced racers.